mtd: ubi: fix unreleased fwnode_handle in find_volume_fwnode()

The 'fw_vols' fwnode_handle initialized via
device_get_named_child_node() requires explicit calls to
fwnode_handle_put() when the variable is no longer required.

Add the missing calls to fwnode_handle_put() before the function
returns.

Cc: [e-mail]
Fixes: 51932f9fc487 ("mtd: ubi: populate ubi volume fwnode")
Signed-off-by: Javier Carrasco <[e-mail]>
Reviewed-by: Zhihao Cheng <[e-mail]>
Signed-off-by: Richard Weinberger <[e-mail]>

drivers/mtd/ubi/vmt.c

···
 		    vol->vol_id != volid)
 			continue;
 
+		fwnode_handle_put(fw_vols);
 		return fw_vol;
 	}
+	fwnode_handle_put(fw_vols);
 
 	return NULL;
 }